Picco's P7TC On Road "Cold" Turbo Glow Plug is suitable for use with on road and marine applications using nitro fuels from 25 to 45% in .12 to .90 size Picco engines. Keeping their race proven filament formula unchanged for many years, Picco glow plugs are made from the finest materials available to provide consistent performance and are the best choice for Picco engines.